mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 08:58:52 +09:00
174 lines
4.8 KiB
C
174 lines
4.8 KiB
C
/*
|
|
* U-boot - processor.h
|
|
*
|
|
* Copyright (c) 2005-2007 Analog Devices Inc.
|
|
*
|
|
* This file is based on
|
|
* include/asm-m68k/processor.h
|
|
* Changes made by Akbar Hussain Lineo, Inc, May 2001 for BLACKFIN
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef __ASM_BLACKFIN_PROCESSOR_H
|
|
#define __ASM_BLACKFIN_PROCESSOR_H
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
|
|
|
|
#include <linux/config.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/current.h>
|
|
|
|
extern inline unsigned long rdusp(void)
|
|
{
|
|
unsigned long usp;
|
|
|
|
__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
|
|
return usp;
|
|
}
|
|
|
|
extern inline void wrusp(unsigned long usp)
|
|
{
|
|
__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
|
|
}
|
|
|
|
/*
|
|
* User space process size: 3.75GB. This is hardcoded into a few places,
|
|
* so don't change it unless you know what you are doing.
|
|
*/
|
|
#define TASK_SIZE (0xF0000000UL)
|
|
|
|
/*
|
|
* Bus types
|
|
*/
|
|
#define EISA_bus 0
|
|
#define MCA_bus 0
|
|
|
|
/* There is no pc register avaliable for BLACKFIN, so we are going to get
|
|
* it indirectly
|
|
*/
|
|
|
|
#if 0
|
|
inline unsigned long obtain_pc_indirectly(void)
|
|
{
|
|
unsigned long pc;
|
|
__asm__ __volatile__("%0 = rets;\n":"=d"(pc));
|
|
return (pc - 4); /* call pcrel24 is 4 bytes long */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* if you change this structure, you must change the code and offsets
|
|
* in m68k/machasm.S
|
|
*/
|
|
|
|
struct thread_struct {
|
|
unsigned long ksp; /* kernel stack pointer */
|
|
unsigned long usp; /* user stack pointer */
|
|
unsigned short seqstat; /* saved status register */
|
|
unsigned long esp0; /* points to SR of stack frame pt_regs */
|
|
unsigned long pc; /* instruction pointer */
|
|
};
|
|
|
|
#define INIT_MMAP { &init_mm, 0, 0x40000000, NULL, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
|
|
|
|
#define INIT_THREAD { \
|
|
sizeof(init_stack) + (unsigned long) init_stack, 0, \
|
|
PS_S, 0\
|
|
}
|
|
|
|
/*
|
|
* Do necessary setup to start up a newly executed thread.
|
|
*
|
|
* pass the data segment into user programs if it exists,
|
|
* it can't hurt anything as far as I can tell
|
|
*/
|
|
#define start_thread(_regs, _pc, _usp) \
|
|
do { \
|
|
set_fs(USER_DS); /* reads from user space */ \
|
|
(_regs)->pc = (_pc); \
|
|
if (current->mm) \
|
|
(_regs)->r5 = current->mm->start_data; \
|
|
(_regs)->seqstat &= ~0x0c00; \
|
|
wrusp(_usp); \
|
|
/* Adde by HuTao, May 26, 2003 3:39PM */\
|
|
if ((_regs)->ipend & 0x8000) /* check whether system in supper mode - StChen */\
|
|
(_regs)->ipend = 0x0;\
|
|
} while(0)
|
|
|
|
/* Forward declaration, a strange C thing */
|
|
struct task_struct;
|
|
|
|
/* Free all resources held by a thread. */
|
|
static inline void release_thread(struct task_struct *dead_task)
|
|
{
|
|
}
|
|
|
|
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
|
|
|
|
#define copy_segments(tsk, mm) do { } while (0)
|
|
#define release_segments(mm) do { } while (0)
|
|
#define forget_segments() do { } while (0)
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
static inline void exit_thread(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
|
|
{
|
|
extern void scheduling_functions_start_here(void);
|
|
extern void scheduling_functions_end_here(void);
|
|
return 0;
|
|
}
|
|
|
|
unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define KSTK_EIP(tsk) \
|
|
({ \
|
|
unsigned long eip = 0; \
|
|
if ((tsk)->thread.esp0 > PAGE_SIZE && \
|
|
MAP_NR((tsk)->thread.esp0) < max_mapnr) \
|
|
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
|
|
eip; })
|
|
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
|
|
#define THREAD_SIZE (2*PAGE_SIZE)
|
|
|
|
/* Allocation and freeing of basic task resources. */
|
|
#define alloc_task_struct() \
|
|
((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
|
|
#define free_task_struct(p) free_pages((unsigned long)(p),1)
|
|
#define get_task_struct(tsk) atomic_inc(&mem_map[MAP_NR(tsk)].count)
|
|
|
|
#define init_task (init_task_union.task)
|
|
#define init_stack (init_task_union.stack)
|
|
|
|
#endif
|